RubyInstaller 2.4.2-2 released

A previous RubyInstaller-2.4.x installation can be updated by installing the new version into the same directory.
Installed gems are not overwritten and will work with the new version without re-installation.
If the previous RubyInstaller version is 2.4.1-1, it’s recommended to run ridk install once again, as offered on the last install page.